Alignment method for pressure welded bladed disk

Abstract

A method for manufacturing bladed disks, or blisks, for turbines by press welding of blades or outer airfoil elements to blade stives or inner airfoil elements on a disk is characterized by the provision on the outer and inner airfoil elements of flanges of excess flash material having alignment holes for dowel pins that assure alignment of leading and trailing edges of the airfoil elements during pressure welding, followed by removal of the excess flash material and the included dowel pins.

What is claimed is: 
     
       1. A method of producing a turbine blade and disk assembly, the method comprising the steps of: providing an annular disk having a plurality of lower airfoil elements formed of pressure weldable material, each lower airfoil element having at its outer end a first flange of excess flash material, said first flange having a plurality of locating holes therein;   providing an upper airfoil element having at its inner end a second flange of excess flange material, said second flange having a plurality of locating holes therein that are in registration with the holes in said first flange when the flanges are in mating juxtaposition with said upper and lower airfoils in predetrmined alignment;   providing a plurality of disposable dowel pins in said holes and cooperating with said flanges to maintain said predetermined alignment;   applying pressure on the outer end of said upper airfoil element so as to weld said upper and lower airfoil elements, including the juxtaposed flanges, together; and   removing by machining away said excess flash material and included dowel pins.   
     
     
       2. The method defined in claim 1, and wherein said upper airfoil element has a third flange formed at the outer end thereof and presenting a surface for application of said pressure; and further comprising the additional step of removing said third flange by cutting along a predetermined tip cut line.